80 lines
2.8 KiB
Dart
80 lines
2.8 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/material.dart';
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import 'package:flutter/src/widgets/framework.dart';
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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testWidgets('InheritedTreeCache returns null if element is not found', (WidgetTester tester) async {
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final InheritedTreeCache parent = InheritedTreeCache();
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expect(parent[InheritedElementA], isNull);
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});
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testWidgets('InheritedTreeCache can look up element from parent', (WidgetTester tester) async {
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final InheritedTreeCache parent = InheritedTreeCache();
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final InheritedTreeCache child = InheritedTreeCache(parent);
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final InheritedElementA elementA = InheritedElementA(const InheritedWidgetA());
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parent[InheritedElementA] = elementA;
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expect(child[InheritedElementA], elementA);
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});
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testWidgets('InheritedTreeCache can look up multiple elements from parent', (WidgetTester tester) async {
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final InheritedTreeCache parent = InheritedTreeCache();
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final InheritedTreeCache child = InheritedTreeCache(parent);
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final InheritedElementA elementA = InheritedElementA(const InheritedWidgetA());
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final InheritedElementA elementB = InheritedElementA(const InheritedWidgetB());
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parent[InheritedElementA] = elementA;
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parent[InheritedElementB] = elementB;
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expect(child[InheritedElementA], elementA);
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expect(child[InheritedElementB], elementB);
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});
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testWidgets('InheritedTreeCache does not cache nulls', (WidgetTester tester) async {
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final InheritedTreeCache parent = InheritedTreeCache();
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final InheritedTreeCache child = InheritedTreeCache(parent);
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final InheritedElementA elementA = InheritedElementA(const InheritedWidgetA());
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// First look up element that has not been cached.
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expect(child[InheritedElementA], null);
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// Then manually add element to parent.
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parent[InheritedElementA] = elementA;
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// Then the child should be able to find it.
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expect(child[InheritedElementA], elementA);
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});
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}
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class InheritedElementA extends InheritedElement {
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InheritedElementA(InheritedWidget widget) : super(widget);
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}
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class InheritedWidgetA extends InheritedWidget {
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const InheritedWidgetA({ Key? key }) : super(child: const SizedBox(), key: key);
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@override
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bool updateShouldNotify(covariant InheritedWidget oldWidget) {
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return true;
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}
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}
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class InheritedElementB extends InheritedElement {
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InheritedElementB(InheritedWidget widget) : super(widget);
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}
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class InheritedWidgetB extends InheritedWidget {
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const InheritedWidgetB({ Key? key }) : super(child: const SizedBox(), key: key);
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@override
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bool updateShouldNotify(covariant InheritedWidget oldWidget) {
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return true;
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}
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}
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